Rotary air-compressor.



PATENTBD MAY 7. 1907. G. G, VOLLMER.

ROTARY AIR COMPRESSOR. APPLIQATION 11.21) um. 15, 1906.

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ROTARY AIR OOMPRESSORr APPLICATION FILED JAN.15, 1906.

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' UNITED STATES GUSTAV C. VOLLMER, OF ST. LOUIS, MISSOURI.

ROTARY AIR-COMPRESSOR.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed January 15, 1906. Serial No. 296,068.

To all whom it may concern:

Be it known that I, GUSTAV O. VOLLMER, a citizen of the United States, and a resident of St. Louis, Missouri, have invented certain new and useful Improvements in Rotary Air-Compressors, of which the following is a specification.

This invention relates to improvements in rotary air compressors, and consists in the novel arrangement, construction and combination of parts as will be fully hereinafter described and claimed.

The object of my invention is to construct an air compressor comprising a revolvingmember provided with pistons operating through the compression chamber, and discharging the compressed air through a pipe, and in connection with the revolving-member I provide a rotary cut-off provided with a recess in which will fit the pistons during the travel and permit said pistons to pass freely.

A further object of my invention is to pro vide a rotary air compressor having a sectional casing through which travels a revolving-member and a cut-off operating in conjunction with the revolving-member to form an abutment and permit the pistons carried by the revolving-member to compress the compressed air within the sectional casing, and pass freely through the cut-off.

In the drawings-Figure 1 is a side elevation of my com lete invention. Fig. 2 is a top plan view 0' the same. Fig. 3 is a view of the o posite side of my invention showing the sha't in section, and one side of the sectional casing removed. Fig. 4 is a vertical cross sectional. view of my invention taken through the center. Fig. 5 is an enlarged detail horizontal sectional view of a portion of the sectional casing showing the piston in relative position therewith, said view taken on the line 5-5 of Fig. 1. Fig. 6 is a detail horizontal sectional view of a portion of the device taken on the line 66 of Fig. 4.

In the construction of the device as shown, I provide a base-plate 7 on which is mounted a pair of supporting arms 8, the upper portion thereof being provided with journalbearings 9. Within the journal-bearings 9 is mounted a shaft 10 to which is rigidly at tached a revolving-member 11.

The revolving-member 11 is provided with a plurality of pistons 12 arranged at equal intervals apart, the one edge of said pistons being tapered as indicated by the numeral.

13, the outer edge beveled as indicated by the numeral 14, and the opposite edge arranged perfectly parallel as indicated by the numeral 15. The periphery of the revolv ing-member is also beveled as indicated by the numeral 16. This arrangement is to correspond with the slot 17 formed in the horizontal rotary cut-off 18 so that during the operation the pistons 12 may freely pass the cut-off during their revolution without obstruction, and yet prevent leakage of air from the compression chamber which will be hereinafter described. Upon the shaft 10, and to one side of the revolving-member 11 is mounted a beveled-gear 19, and on said shaft 10 on the opposite side of said revolv ing-member is mounted a pulley wheel 20 by which the revolving-member is placed in operation by any motive power. Upon the base 7 is also mounted a pair of brackets 21 which support and hold in rigid osition a casing 22, which forms one side 0 the compression chamber through which the pistons pass and compress the air within.

To the opposite side of the revolvingmember is located the casing 28 which forms the other section of the compression chamber, and rigidly held in position by means of the bolts 24 passing through the flanges 25 ofboth sections of the casing. The inner surface of the casing is provided with a strip of packing material 26 which comes in contact with the side portion 27 of the revolving-member 11, thus preventing the escape of air from the compression chamber at that section of the casing. The pistons are properly ground to make a perfect fit within the chamber formed by the casing so that the air will not escape between said pistons and the walls of the casing.

By reference to Fig. 1, it will be observed that the casing is constructed to extend a short distance above the center line of the revolving-member which is to permit one of the pistons to enter the compression chamber at a point slightly in advance to the dismissal of the other. 1

Upon the casing 22 are provided supports 27 in which is mounted a vertical shaft 28, the upper end of which is provided with a beveled pinion 29, the teeth of which mesh with the teeth of the beveled gear 19, and on the lower end of said shaft 28 is rigidly connected the cut-off disk 18. The cut-off disk 18 consists of a circular disk, its upper side being concave as indicated by the numeral 31, and so arranged as to conform with the beveled periphery 16 of the revolving-member. The under side of the cut-off 18 is convex in form, and conforms with the inner surface of the casing through which the pistons travel. The slot 17 formed in the cut-off 18 (see Fig. 6) is arranged of sufficient size and shape to permit the insertion of the pistons at the proper period and permit the same to pass out during the revolution of both revolving-member and cut-off.

The compression chamber is provided with a discharge pipe 32, to which is connected a check-valve 33 through which the compressed air is discharged into any suitable reservoir or supply tank. The location of the pipe 32 (see Fig. 6) is as near to the periphery of the cut-off as will be found practicable, so that when the piston is in position as shown by the dotted lines in Fig. 6, and indicated by the numeral'34, the space contained between the cut-off, walls of the casing, and piston, contain the compressed air, and at that point being discharged through the pipe 32.

The pistons Will begin to enter the recess 17 of the cut-off disk 18 at a point when said recess 17 is in the position as shown by dotted lines in Fig. 6, indicated by the numeral 35, and will follow and entirely incase the piston when in position as shown by solid lines in Fig. 6, preventing the escape of air between the cut-off and the following piston which has entered the compression chamber.

To prevent accident, or any admission of foreign substance from contacting with the cut-off 18, I provide a housing or shield. 36

entirely incasing the same, and I may, if i desired, provide a guard around the entire revolving-member.

Having fully described my invention, what I claim, is

1. A rotary air compressor comprising a revolving-member mounted upon a shaft, a casing forming a compression chamber through which the revolvingmember operates, said casing covering a portion of the revolving-member, a cut-off located at the bottom of the revolving-member and operated by the revolving-member, said cut-off having its upper casing concave and its lower face convex to correspond with the formation of the casing and the periphery of the revolving-member, and provided with a recess for the admission of the revolving-member, substantially as specified.

2. A rotary air compressor comprising a circular disk mounted upon a shaft, a plurality of pistons carried by said disk, the periphery of said disk being beveled and the pistons being also tapered, a casing covering a portion ofthe disk, and forming a passage through which the pistons travel in which air is compressed, a horizontal circular cutoff located at the bottom of the disk and. operating through the casing, said cut-off having its upper surface concave, and its lower surface convex to correspond to the form of the casing and the periphery of the revolving disk, a shaft supported by bearings carried by. the casing for operating the cut-off, said cut-off provided with a recess to receive the pistons as they pass out through the passage in the casing, a beveled-gear located on the shaft carrying the disk, and a beveled pinion located on the shaft operating the cut-off, a discharge pipe connected to the casing and communicating with the air passage to receive the compressed air from the air pas-' sage, and a housing located around the cutoff, substantially as specified.

3. A rotary air compressor comprising a circular disk mounted upon a shaft, a plurality of pistons carried by said disk, the periphery of said disk being beveled andthe pistons being also tapered, a casing covering a portion of the disk, and forming a passage through which the pistons travel in which air is compressed, a horizontal circular cutoff located at the bottom of the disk and operating through the casing, said cut-off having its upper surface concave, and its lower surface convex to correspond to the form of the casing and the periphery of the revolving disk, a shaft supported by bearings carried by the casing for operating the cut-off, said cut-off provided with a recess to receive the pistons as they pass out through the passage in the casing, a beveled-gear located on the shaft carrying the disk, and a beveled pinion located on the shaft operating the cutoff, a discharge pipe connected to the casing and communicating with the air passage to receive the compressed air from the air passage, and a housing located around the cutoff, packing located within each wall of the casing and contacting withthe rim of the disk, substantially as specified.

In testimony whereof, I have signed my name to this specification, in presence of two subscribing witnesses.

GUSTAV C. VOLLMER.

Witnesses:

ALFRED A. Eroxs, WALTER C. STEIN. 

